I've written an OpenGL tool to visualize .3ds files. To import a 3ds file I use Assimp (http://assimp.sourceforge.net/). I use Blender to create example 3ds files. The problem is now that when I read a mesh from the .3ds file it's transformation matrix is always identity. However the coordinates of the vertices are in world space.The source code to load a mesh looks like this.m is always identity but i don't know why.